diff --git a/patches/1401/update_billing_status_for_zero_value_order.py b/patches/1401/update_billing_status_for_zero_value_order.py
new file mode 100644
index 0000000..afeed55
--- /dev/null
+++ b/patches/1401/update_billing_status_for_zero_value_order.py
@@ -0,0 +1,29 @@
+# Copyright (c) 2013, Web Notes Technologies Pvt. Ltd. and Contributors
+# License: GNU General Public License v3. See license.txt
+
+import webnotes
+from webnotes.utils import flt
+
+def execute():
+	for order_type in ["Sales", "Purchase"]:
+		for d in webnotes.conn.sql("""select par.name, sum(ifnull(child.qty, 0)) as total_qty 
+			from `tab%s Order` par, `tab%s Order Item` child  
+			where par.name = child.parent and par.docstatus = 1 
+			and ifnull(par.net_total, 0) = 0 group by par.name""" % 
+			(order_type, order_type), as_dict=1):
+				
+				billed_qty = flt(webnotes.conn.sql("""select sum(ifnull(qty, 0)) 
+					from `tab%s Invoice Item` where %s=%s and docstatus=1""" % 
+					(order_type, "sales_order" if order_type=="Sales" else "purchase_order", '%s'), 
+					(d.name))[0][0])
+				
+				per_billed = ((d.total_qty if billed_qty > d.total_qty else billed_qty)\
+					/ d.total_qty)*100
+				webnotes.conn.set_value(order_type+ " Order", d.name, "per_billed", per_billed)
+				
+				if order_type == "Sales":
+					if per_billed < 0.001: billing_status = "Not Billed"
+					elif per_billed >= 99.99: billing_status = "Fully Billed"
+					else: billing_status = "Partly Billed"
+	
+					webnotes.conn.set_value("Sales Order", d.name, "billing_status", billing_status)
\ No newline at end of file
diff --git a/patches/patch_list.py b/patches/patch_list.py
index 04a9288..5bf730a 100644
--- a/patches/patch_list.py
+++ b/patches/patch_list.py
@@ -265,4 +265,6 @@
 	"patches.1312.p02_update_item_details_in_item_price",
 	"patches.1401.p01_move_related_property_setters_to_custom_field",
 	"patches.1401.p01_make_buying_selling_as_check_box_in_price_list",
+	"patches.1401.update_billing_status_for_zero_value_order",
+	"execute:webnotes.reload_doc('stock', 'doctype', 'price_list') #2014-01-20",
 ]
\ No newline at end of file